Moria, or Khazad-dûm, was founded by Durin the Deathless.

Apr 6, 2018 - Moria, or Khazad-dûm, was founded by Durin the Deathless. Durin awoke at Mount Gundabad, in the Misty Mountains, in the period of time known as the Years of the Trees, and came upon a shimmering lake beneath the mountain Celebdil with a crown of stars reflected in its waters. He named it Kheled-zaram as it was known in Dwarvish tongue, the Mirrormere. Thereafter it remained a revered place amongst the Dwarves. In the caves above the lake, Durin's folk built Moria.

Khazad-dûm, Mines Of Moria

Who was Durin the Deathless? - Quora

Moria - Tolkien Gateway

Moria, or Khazad-dûm, was founded by Durin the Deathless.

Mirrormere - Tolkien Gateway

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Durin the Deathless

Did Moria even exist yet at the time the Balrog hid underneath those vast caverns? - Quora